CVE-2026-97701 | BDVDB-2026-400183 Detail
zulipzulip
Description#
Zulip is an open-source team collaboration tool. In Zulip Server versions through 12.1, the authenticated POST /messages/render endpoint renders the content parameter without enforcing the normal message length limit used by message send and edit operations. An authenticated user can submit Markdown up to the server body-size limit, causing disproportionate backend CPU consumption, and repeated or concurrent requests can degrade Markdown rendering performance or backend availability for other users. This issue is fixed in version 12.2.
Impact#
Per CVSS v3.1: confidentiality impact none, integrity impact none, availability impact high. Attack vector: network.
Weaknesses#
- CWE-770 Allocation of Resources Without Limits or Throttling
References#
- https://github.com/zulip/zulip/security/advisories/GHSA-m257-w4r5-5rmf
- https://github.com/zulip/zulip/pull/39913
- https://github.com/zulip/zulip/commit/31773c77c501391ede0fa8ec727f39508664e0ae
- https://github.com/zulip/zulip/commit/4d94dd2ee6337a4b3351694dd314a45d3fe11031
- https://github.com/zulip/zulip/releases/tag/12.2
- https://zulip.readthedocs.io/en/latest/overview/changelog.html#zulip-server-12-2
Exploit#
No public exploit known
History#
- Version 1Record published in the CVE List.